Cathode ray tube

Details Cathode ray tube Cathode ray tube

1985-03-07

1990-02-06

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

H01J 2958

Patent

active

048990795

ABSTRACT:
In a color display tube including an envelope, a display screen, an electron gun system for producing and focusing a plurality of electron beams directed at the display screen, and coils for deflecting the beams, convergence of the beams independently of focusing is effected by a helically wound resistive element disposed in the envelope between the electron gun system and the deflection coils. The element surrounds the electron beams and is dimensioned such that, when predetermined potentials are applied thereto, a potential gradient is produced along its length which establishes a relatively large diameter, strong convergence lens through which the beams pass.

REFERENCES:
patent: 2123636 (1938-07-01), Schwartz
patent: 3011090 (1961-11-01), Moodey
patent: 3143681 (1964-08-01), Schlesinger
patent: 3223871 (1965-12-01), Schlesinger
patent: 3374386 (1968-03-01), Charbonnier et al.
patent: 3909655 (1975-09-01), Grimmett et al.

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